Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$3 \frac { 4 } { 99 } + 4 \frac { 7 } { 33 } - 5 \frac { 9 } { 11 }$$

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